The utility model discloses a function detection device for an engineering machinery vehicle storage battery current detection instrument, belonging to the technical field of vehicle electronic product detection. The utility model mainly solves the problems of messy, nonintegration, large land occupation, inconvenience in operation and low efficiency of the conventional detection device. The function detection device is characterized by comprising a direct current source, a PLC, a direct current control unit module, a clamp, a liquid crystal display screen, a load, a control keyboard, a cable, a frame and a cabinet body, wherein the liquid crystal display screen is mounted on the first layer of the frame; the direct current source, the direct current control unit module and the PLC are mounted inside the electric control cabinet body which is mounted at the third layer on the back of the frame; the clamp is mounted on the second layer of the frame; and the PLC is connected with the direct current power source, the direct current control unit module, the liquid crystal display screen, the load, the control keyboard and the clamp. The function detection device has the advantages of high automation and convenient equipment upgrade, and is mainly used for the detection of the engineering machinery vehicle storage battery current detection instrument.